Add a comment to explain what's really going on.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163005 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
index 1fde5a2..3ee3db5 100644
--- a/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
+++ b/lib/Target/ARM/AsmParser/ARMAsmParser.cpp
@@ -5347,6 +5347,12 @@
case ARM::tMUL: {
// The second source operand must be the same register as the destination
// operand.
+ //
+ // In this case, we must directly check the parsed operands because the
+ // cvtThumbMultiply() function is written in such a way that it guarantees
+ // this first statement is always true for the new Inst. Essentially, the
+ // destination is unconditionally copied into the second source operand
+ // without checking to see if it matches what we actually parsed.
if (Operands.size() == 6 &&
(((ARMOperand*)Operands[3])->getReg() !=
((ARMOperand*)Operands[5])->getReg()) &&